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Paleomagnetic age and palaeobiological significance of hominoid fossil strata of yuanmou Basin in Yunnan

Science China Earth Sciences 2004年第5期47卷 405-411页

作者： Friedrich A. Heller Institute of Geophysics ETH Zurich Switzerland CH-8093

The two sections containing hominoid fossils in the yuanmou Basin, Yunnan Prov-ince have been studied by means of magnetostratigraphy. The results are as follows. The Xiaohe section records over 8 polarity zones corresponding to Cande-Kent95 time scale, including C3Br.1n, C3Br.1r, C3Br.2n, C3Br.2r, C4n.1n, C4n.1r, C4n.2n and C4n.2r, attaching to Late Mio-cene. This section comprises two layers of hominoid fossils: the lower layer (the 1st layer in fig. 4) which records the lower portion of C4n.2r with paleomagnetic age of 8.20—8.10 Ma and the upper layer (the 16th layer in fig. 4) which records C3Br.1r with paleomagnetic age of 7.20—7.15 Ma. So the age of hominoid fossils in the Xiaohe section is about 8.20—7.15 Ma. The Leilao section records over 11 polarity zones corresponding to Cande-Kent95 time scale, including C3Br, C3Br.1n, C3Br.1r, C3Br.2n, C3Br.2r, C4n.1n, C4n.1r, C4n.2n, C4n.2r, C4n.3n and C4n.3r, attaching to Late Miocene. This section also consists of two layers of hominoid fossils: the lower layer (the 3rd layer in fig. 3) which records C4n.2r with the age of 8.20—8.10 Ma and the upper layer(the 19th layer in fig. 3) which records the middle portion of C3Br with the age of 7.15—7.1 Ma. So the age of hominoid fossils in the Leilao section is about 8.20—7.10 Ma. Sedimentary environments reflected in both sections are extremely similar, and the ages of hominoid fossils are of correspondency. The age of the lower and upper fossil layers is 8.20—8.10 Ma and 7.20—7.10 Ma respectively, which probably imply that hominoids living in Xiaohe and Leilao basins have uniform activity areas. There were hominoids activities all along during 8.00—7.00 MaBP in this field.

关键词： yuanmou Basin, hominoid, paleomagnetism, chronology.

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Preliminary study on enamel microstructure of yuanmou Miocene hominoids of China

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Science China Earth Sciences 2003年第11期46卷 1142-1150页

作者：赵凌霞郑良高峰姜础 Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of Sciences Beijing 100044 China Institute of Archaeology of Yunnan Province Kunming 650118 China yuanmou Man Museum Yuanmou 651300 China

Preliminary study on enamel microstructure of 5 lower permanent incisors of Late Mio-cene yuanmou hominoids was conducted using a scanning electron microscope (SEM). The enamel incremental markings, as well as perikymata spacing and its periodicity were observed and counted. Using the perikymata number and periodicity, the crown formation times of the incisors are estimated. The transverse and longitudinal microstructures of the enamel prisms are also ob-served. Comparison of the dental development and enamel microstructure features of yuanmou hominoids with those of Lufeng hominoids shows that there are similarities and also some differ-ences between them. The relationship between yuanmou hominoids and early hominids is dis-cussed.

关键词： early hominid origin, yuanmou hominoid, enamel microstructure, dental development.

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New Eusauropod Dinosaur from yuanmou of Yunnan Province, China

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Acta Geologica Sinica(English Edition) 2006年第1期80卷 1-10页

作者： LUE Junchang LI Shaoxue JI Qiang WANG Guofu ZHANG Jiahua DONG Zhiming Institute of Geology Chinese Academy of Geological Sciences Beijing 100037 yuanmou Museum Yuanmou Yunnan 651300 Chuxiong Museum Chuxiong Yunnan 675000

yuanmousaurusjiangyiensis gen. et sp. nov. is erected based on an incomplete skeleton. It is characterized by more complex structures of the neural arches in the dorsal vertebrae than those in Omeisaurus, but less complex than those of Euhelopus; the dorsal vertebra bears 9 laminae, forming three cavities on the lateral surface of the neural arch; the dorsal vertebral neural spines with dorsoventrally-oriented cavities are similar to those of Omeisaurus and Patagosaurus. yuanmousaurus is more primitive than Euhelopus, but more derived than Omeisaurus. The similar dorsal vertebral structure between yuanmousaurus and Patagosaurus may indicate that they have a close relationship to each other.

关键词： yuanmou Yunnan Province Middle Jurassic yuanmousaurus Sauropoda

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A PRELIMINARY STUDY ON GENETICS AND TYPE FOR EARTH FOREST IN yuanmou BASIN

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Science China Chemistry 1990年第3期33卷 374-386页

作者：钱方凌小惠 Institute of Geomechanics Chinese Academy of Geological Sciences Beijing 100081 PRC Laboratory of Loess and Quaternary Geology Academia Sinica Xi'an 710061 PRC

The earth forest is a geomorphic type of the running water found in recent years in China. At some distribution regions of loose or semicemented fluviolacustrine facies strata, owing to scouring of rainstorm runoff, thousands of gullies and ravines and some stretches of earth columns were formed, like a stretch of forest observed at a distance, thus it was named earth *** earth forest landform developed the most typically in the yuanmou Basin, Yunnan Province. Through the study, such as strata of fluviolacustrine facies, neotectonics, geomorphics, soil, climate, vegetation, etc., the authors pointed out the condition for forming the earth forest landform and its five development stages, and then divided it into four types: thin gully-earth gemma type, round basin-earth column type, broad gully column fort type and slope-remaining column type.

关键词： yuanmou Basin earth forest genetics and type.

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Statistical analyses of metric data of hominoid teeth found in yuanmou of China

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Chinese Science Bulletin 2000年第10期45卷 936-942页

作者： LIU Wu, ZHENG Liang & JIANG Chu1. Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China 2. Institute of Archaeology of Yunnan Province, Kunming 650118, China 3. yuanmou Man Museum, yuanmou 651300, China Institute of Vertebrate Paleontology and Paleoanthropology Chinese Academy of Sciences Beijing China Institute of Archaeology of Yunnan Province Kunming China yuanmou Man Museum Yuanmou China

Mesial-distal and buccal-lingual dimensions of 1 266 hominoid teeth found in yuanmou of Yunnan Province during the period of 1986 and 1988 have been measured. The statistical analyses of the metric data show that the tooth sizes of yuanmou hominoid can be divided into big and small two types, and most tooth dimensions display obvious bimodalities in both histograms and 2 dimensional plots. The coefficients of variance (CV) reveal that the CVs of yuanmou hominoid tooth sizes are within or close to the CV ranges of Lufengpithecus and extant great apes. The comparisons of tooth sizes and their proportions indicate that yuanmou hominoids have close affinities with Lefeng and Kaiyuan hominoids, and have obvious differences with Gorilla, Chimpanzee and Orangutan. The authors believe that the hominoid fossils found in yuanmou in the past 10 years represent a single species with highly sexual dimorphism in morphology and this species may have a close evolutionary relationship with the hominoids found in

关键词： human origin yuanmou hominoid dental metrics statistical analyses.

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